Status of the CMS Phase I pixel detector upgrade

Spannagel, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Filipovic, Nicolas and Bencze, György and Hajdú, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Béni, Noémi Tekla and Czellár, Sándor and Karancsi, János and Molnár, József and Szillási, Zoltán and Bartók, Márton and Makovec, Alajos and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Veres, Gábor (2016) Status of the CMS Phase I pixel detector upgrade. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 831. pp. 71-75. ISSN 0168-9002

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Abstract

A new pixel detector for the CMS experiment is being built, owing to the instantaneous luminosities antic- ipated for the Phase I Upgrade of the LHC. The new CMS pixel detector provides four-hit tracking while featuring a significantly reduced material budget as well as new cooling and powering schemes. A new front- end readout chip mitigates buffering and bandwidth limitations, and comprises a low-threshold comparator. These improvements allow the new pixel detector to sustain and improve the efficiency of the current pixel tracker at the increased requirements imposed by high luminosities and pile-up. This contribution gives an overview of the design of the upgraded pixel detector and the status of the upgrade project, and presents test beam performance measurements of the production read-out chip.

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